#include <bits/stdc++.h>
using namespace std;

int main(){
#ifndef ONLINE_JUDGE
    freopen("z.txt", "r", stdin);
#endif
    ios::sync_with_stdio(false);cin.tie(nullptr);cout.tie(0);
    double r; cin >> r;
    cout << fixed << setprecision(2) << r + 1 << endl;
    return 0;
}